Claridge's in London's Mayfair has launched its first ever spa, which spans 7,000 sq ft.
The spa is located three floors down in the basement and features a swimming pool, steam rooms, sauna and seven treatment rooms.
It comes after the hotel received planning permission to add seven storeys, including five in the basement, in December 2016.
The spa was designed by interior architect Andre Fu, who took inspiration from traditional Japanese temples and Zen gardens in Kyoto, using natural textures such as limestone, wood and water.
Guests will be given kimonos and welcomed with a 'foot ceremony' upon entry.
Hair, beauty and wellness brands Josh Wood, Augustinus Bader and Facegym have collaborated with Claridge's to create a range of professional and exclusive treatments.
Guests will also have the chance to receive treatments from visiting experts such as nail artist Harriet Westmoreland and acupuncturist Ross J. Barr.
Inge Theron, Maybourne Hotel Group's creative director of spa and wellness and founder of Facegym, said: "We have created a spa here at Claridge's where guests will find both holistic practices and results driven high-tech all under one roof.
"Claridge's has long been a temple of good living with a philosophy of enjoying life to the full, and so now, as well as pouring guests the perfect martini, we can also rejuvenate and restore with the perfect treatment, to strike that all important balance.
"Claridge's Spa is the very beginning of a new wellness journey for Maybourne Hotel Group."
Claridge's Spa is open to guests and non-guests at the hotel from Monday to Sunday, 8am to 9pm. Treatments are 90 minutes and include access to the pool.
Maybourne Hotel Group owns and manages Claridge's, the Connaught, the Berkeley, the Maybourne Beverly Hills and the Maybourne Riviera.